<!--
 * new page
 * @author: eminem89
 * @since: 2023-12-24
 * Person.vue
-->
<template>
    <div class="person">
        <h1>情况一：监视ref定义的基本类型数据</h1>
        <h2>当前求和为：{{ sum }}</h2>
        <button @click="changeSum">点我sum+1</button>
    </div>
</template>

<script setup lang="ts" name="Person">
import { ref, watch } from 'vue';
//数据
let sum = ref(0);
//方法
function changeSum() {
    sum.value += 1;
}
//监视 情况一：监视ref定义的基本类型数据
const stopWatch = watch(sum, (newValue, oldValue) => {
    console.log('sum变化了', newValue, oldValue);
    if (newValue >= 10) {
        stopWatch();
    }
});
</script>

<style scoped>
.person {
    background-color: skyblue;
    box-shadow: 0 0 10px;
    border-radius: 10px;
    padding: 20px;
}

button {
    margin: 0 5px;
}
</style>
